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Because both the benefits and the downside are relatively trivial. There's no universal consensus in the medical community. Hence, it is and ought to be purely a matter of preference. Definitely not worthy of your manic crusade.
benefits are non-existent and downsides are catastrophic, from hundreds killed annually to the normative sexual dysfunction prevalent in USA. if you are interested in physician consensus, consider the history of MGM in Australia and Britain: http://www.historyofcircumcision.net/
